Methane flux, vertical gradient and mixing ratio measurements in a tropical forest
Measurements of CH4 mixing ratio, vertical gradients and turbulent fluxes were carried out in a tropical forest (Reserva Biolgica Cuieiras), about 60 km north of Manaus, Brazil. The methane mixing ratio and flux measurements were performed at a height of 53 m (canopy height 35 m). In addition, verti...
| Autor principal: | Querino, Carlos Alexandre Santos |
|---|---|
| Outros Autores: | P Smeets, C. J.P., Vigano, Ivan, Holzinger, Rupert, Moura, V., Gatti, Luciana Vanni, Martinewski, Alexandre, Manzi, Antônio Ocimar, Arájo, A. C. de, Röckmann, Thomas |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Atmospheric Chemistry and Physics
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/16184 |
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oai:repositorio:1-16184 |
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oai:repositorio:1-16184 Methane flux, vertical gradient and mixing ratio measurements in a tropical forest Querino, Carlos Alexandre Santos P Smeets, C. J.P. Vigano, Ivan Holzinger, Rupert Moura, V. Gatti, Luciana Vanni Martinewski, Alexandre Manzi, Antônio Ocimar Arájo, A. C. de Röckmann, Thomas Carbon Dioxide Diurnal Variation Forest Canopy Methane Mixing Ratio Tropical Forest Turbulent Boundary Layer Amazonas Brasil Manaus Measurements of CH4 mixing ratio, vertical gradients and turbulent fluxes were carried out in a tropical forest (Reserva Biolgica Cuieiras), about 60 km north of Manaus, Brazil. The methane mixing ratio and flux measurements were performed at a height of 53 m (canopy height 35 m). In addition, vertical CH4 gradients were measured within the canopy using custom made air samplers at levels of 2, 16 and 36 m above ground. The methane gradients within the canopy reveal that there is a continuous methane source at the surface. No clear evidence for aerobic methane emission from the canopy was found. The methane fluxes above the canopy are small but consistently upwards with a maximum early in the morning. The measured fluxes are in agreement with the observed CH4 gradient in the canopy. In the morning hours, a strong canopy venting peak is observed for both CH4 and CO2, but for CO2 this peak is then superimposed by photosynthetic uptake, whereas the peak lasts longer for CH4. Monthly averaged diurnal cycles of the CH 4 mixing ratio show a decrease during daytime and increase during nighttime. The magnitude of the difference in CH4 mixing ratio between day and night gradually increases throughout the wet season. The fluxes required to explain the nighttime increase are in agreement with the nighttime fluxes measured above the canopy, which implies that the CH4 increase in the nighttime boundary layer originates from local sources. © 2011 Author(s). 2020-05-25T20:59:16Z 2020-05-25T20:59:16Z 2011 Artigo https://repositorio.inpa.gov.br/handle/1/16184 10.5194/acp-11-7943-2011 en Volume 11, Número 15, Pags. 7943-7953 Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ application/pdf Atmospheric Chemistry and Physics |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Carbon Dioxide Diurnal Variation Forest Canopy Methane Mixing Ratio Tropical Forest Turbulent Boundary Layer Amazonas Brasil Manaus |
| spellingShingle |
Carbon Dioxide Diurnal Variation Forest Canopy Methane Mixing Ratio Tropical Forest Turbulent Boundary Layer Amazonas Brasil Manaus Querino, Carlos Alexandre Santos Methane flux, vertical gradient and mixing ratio measurements in a tropical forest |
| topic_facet |
Carbon Dioxide Diurnal Variation Forest Canopy Methane Mixing Ratio Tropical Forest Turbulent Boundary Layer Amazonas Brasil Manaus |
| description |
Measurements of CH4 mixing ratio, vertical gradients and turbulent fluxes were carried out in a tropical forest (Reserva Biolgica Cuieiras), about 60 km north of Manaus, Brazil. The methane mixing ratio and flux measurements were performed at a height of 53 m (canopy height 35 m). In addition, vertical CH4 gradients were measured within the canopy using custom made air samplers at levels of 2, 16 and 36 m above ground. The methane gradients within the canopy reveal that there is a continuous methane source at the surface. No clear evidence for aerobic methane emission from the canopy was found. The methane fluxes above the canopy are small but consistently upwards with a maximum early in the morning. The measured fluxes are in agreement with the observed CH4 gradient in the canopy. In the morning hours, a strong canopy venting peak is observed for both CH4 and CO2, but for CO2 this peak is then superimposed by photosynthetic uptake, whereas the peak lasts longer for CH4. Monthly averaged diurnal cycles of the CH 4 mixing ratio show a decrease during daytime and increase during nighttime. The magnitude of the difference in CH4 mixing ratio between day and night gradually increases throughout the wet season. The fluxes required to explain the nighttime increase are in agreement with the nighttime fluxes measured above the canopy, which implies that the CH4 increase in the nighttime boundary layer originates from local sources. © 2011 Author(s). |
| format |
Artigo |
| author |
Querino, Carlos Alexandre Santos |
| author2 |
P Smeets, C. J.P. Vigano, Ivan Holzinger, Rupert Moura, V. Gatti, Luciana Vanni Martinewski, Alexandre Manzi, Antônio Ocimar Arájo, A. C. de Röckmann, Thomas |
| author2Str |
P Smeets, C. J.P. Vigano, Ivan Holzinger, Rupert Moura, V. Gatti, Luciana Vanni Martinewski, Alexandre Manzi, Antônio Ocimar Arájo, A. C. de Röckmann, Thomas |
| title |
Methane flux, vertical gradient and mixing ratio measurements in a tropical forest |
| title_short |
Methane flux, vertical gradient and mixing ratio measurements in a tropical forest |
| title_full |
Methane flux, vertical gradient and mixing ratio measurements in a tropical forest |
| title_fullStr |
Methane flux, vertical gradient and mixing ratio measurements in a tropical forest |
| title_full_unstemmed |
Methane flux, vertical gradient and mixing ratio measurements in a tropical forest |
| title_sort |
methane flux, vertical gradient and mixing ratio measurements in a tropical forest |
| publisher |
Atmospheric Chemistry and Physics |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/16184 |
| _version_ |
1787142266568048640 |
| score |
11.755432 |